Measured-service telephone system



July 3, 1923.

v 1,460, 726 'r. G. MARTIN MEASURED SERVICE TELEPHONE SYSTEM Filed June 14, 1919 2 Sheets-Sheet 1 [nuanlur 75/502 5. 11 5mm -July 3, 1923. r 1,460,726

T. G. MARTIN MEASURED SERVICE TELEPHONE SYSTEM Filed June 14, 1919 2 Sheets-Sheet 2 llll l [ELL/E nmr 775/552 5.- HEP/7n 'HZZg Patented July 3, 1923. v

,UITED s OFF! TALBOT o. MARTIN, or CHICAGO, ILLINOIS, AssIGNon TO AUTOMATIC nLnc'rnIo e011:-

PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF. ILLINOIS.

MEASURED-SERVICE TELEPHONE SYSTEM.

Application filed June 14, 1919. Serial No. 304,184.

T all whom it may concern:

Be it known that I, TALBOT G. MARTIN, a

' 4 citizen of the United States of America, and

resident of Chicago, Cook County,

have invented a certain new and useful Imrovement in Measured-Service Telephone ystems, of which the following is a specification.

My invention relates in general to anim 1 provement in measured service telephone systems, and more specifically to an improved means for controlling a pay station or coin collecting device in an automatic telephone system.

Among the objects of my invention are to provide improved circuits for automatically controlling a coin collecting device such as is shown in U. S. Letters Patent No. 1,043,219, granted November 5 1912, to O. F. Forsberg. Other objects are to provide a repeater in ,an automatic telephone system which will be inserted in the talking circuit and which will automatically control the col-' lection or refunding of the coin accurately, the collection and refunding of the coin being controlled from a high voltage positive or negative battery when the calling subscriber hangs up, the polarity depending upon whether or not the called subscriber has" answered.

In the drawings I have shown only a portion of the apparatus necessary to extend a talking circuit from a calling subscriber to a called subscriber, only that portion being shown which has to do with the control of the coin collector.

Fig. -1 shows a repeater common to the lines. Fig. 2 shows a repeater similar to that of Fig. 1, but which is individual to the me. 4

I have shown a pay station telephone equi ped with a coin collecting mechanism simi ar to that shownin the above cited patent and having. a calling device for .controlling the automatic switches.

The elements of the coin collecting device at substation A, Fig. 1, .are shown only diagrammatlcally,

tion that in placeof a single pair of make s rings at 111 and 112 of said patent I have s own a make before break combination of springs, which are of 9 13. 6 controlled by Illinois,

itbeing understood that the mechanism is the same as that shown in the Forsberg patent referred to with the exoep-" pulsing circuit of both the coin and the armature of the magnet in the same manner as in the Forsberg patent and it is thought that such mechanism need not be further illustrated herein.

Individual to the line of substation A I have shown a line switch C of the well known rotary type which has access to a plurality of trunk lines, each trunk line leading through a repeater such as that shown at D to a selector switch. The system Inlay include qonnedtor switches also, as shown in United States Letters Patent No. 1,269,245, granted June 11, 1918, to Albert Andersen. Ihe connector in this patent is of the reverse battery type and has the special provision of being able to call certain lines free; that is, by preventing the reversal of battery when certain lines are called, such lines may be called without charge.

I will now describe the 'method of operationwhen th subscriber at station Aattempts a call. It will be seen that the calling device (I. D. is normally short circuited through the coin, controlled springs 2 and 3 so that the subscriber mustfirst'drop a coin in the slot to open the springs 2and 89 3 and to close springs'2 and 4 to connect the coin controlling magnet 5 to the line circuit before a call may be set up. The subscriber therefore first deposits the, coin to remove this short circuit and then removes his receiver from the hook to close the circuit of the line relay of the line switch C. Relay 6 prepares a circuit for rotary magnet 7 'direct to the private wiper-8 at springs 9 so that if the trunk before nwhich the switch the next trunk and so on until an idletrunk line is reached and no ground'is found by! the wipe-r 8. At this time relay 10 energizes from ground through springs 11 in series with the rotary "magnet 7, being of .too high resistance to permit the energization of magnet 7. Relay 10 discpnnects relay 6 and ground from the calling line and switches said line through to wipe-rs 12 and 13. and thence to theseized trunk.

As soon as rela 10 energizes a circuit is completed for the line relay 1a of repeater D in series with the calling line. Relay 14 en.- ergizes and closes the springs 16in the imwill the switch ahead and closes the circuit of relay 15.; The-closure of springs 16 completes a bridge across the trunk conductors 17 and 18 which as explained lead to a selector switch.- 'The bridge. may be traced from conductor 17, through springs 18 and 19, lower winding of electro-' polarized relay 20, winding of relay 21, and springs 16 to conductor 18. Y The closure of this circuit energizes the line relay of the switch ahead which in turn energizes the release relay of that switch to supply ground back over conductor 22, through springs 23 and 24, to the release trunk to hold the relay 10 of the switch 0' energized. When relay l5 energized it closed a circuit for the upper Winding of the polarized relay 20 whlch 1s differential and having battery flowing in opposite direction in its two windings, does not energize at this time.

The calling subscriber will now operate his calling device in accordance with thevarious digits of the called subscribers numher in order to operate the selector and connector to extend the connection to the called line. Each operation of the calling device opens the circuit of relay 14 correspondingly. The first decnergization of relay 14 closes a ,circuit' from ground -through springs 25 and 26, through springs 27 and through relay 28 to battery. Relay 28 energizes to supply an additional ground to the release trunk through springs 29, and closes a short circuit about relays 20 and 21 through springs 18 and 31. Each deenergization of relay 14 therefore opens the circuit of the line relay of the selector (on the first digit) at springs 16, to operate the selector to seize the connector. The connector is then controlled by relay 14 through springs 16 to find the desired line and automatically connect ringing current thereto.

Assuming the called line to be idle and assuming that it is one of the lines which require a charge, then when the called subscriber answers by removing his receiver, the back bridge relay of the connector will be energized to reverse the connections of the line relay of the connector with regard to the talking circuit, thereby reversing the battery flow in the trunk conductors Hand 18 and through the lower winding of the rclay 20. Relay 20 will energize at this time to close the springs 32in the circuit of the slow relay 33. Relay 33 energizes to prepare a circuit from the high voltage positive collect battery X which will later be completed, closes a locking circuit for itself from ground through springs 34 and 35, springs 36, 24 and 37, and also connects the same ground through springs 36 and 24 to the release trunk. The opening of springs 23 and 24 opens the circuit from the switch ahead which initially supplied ground to the-"release trunk. I

Conversation may now proceed over the heavy conductors shown and after being completed the release of the connection is emmas,

controlled by the restoration of the receiver to the switch hook at the calling phone, thereby opening the line circuit and the circuit of the line relay 14 of the repeater D. Relay 14 opens the'springs 16 inthecircuit of the line relay of the connector to cause the release of the connector and selector, opens the circuit of relay 15 and completes a circuit from ground through springs25 and 26, springs 27, which are held closed for a short interval by slow relay 15, and relay 28 to battery. Relay 28 again connects ground to the release trunk at springs 29 and prepares a circuit at springs 30 which is completed as soonas relay 15 falls back and extends from groundthrough springs 34 and 38, springs 30, and relay 40 to bat-s positive high voltage battery X through springs 43 and 44, wiper 13, springs 45 aiud 46, springs 2 and 4 of the coin. controlled springs, and through magnet 5 to ground. The current from battery X. is of such a direction and of such a voltage as to cause the.

operation of magnet 5 to collect the coin which was deposited and restore the springs 2, 3 and 4to normal. Relay 40 after a short interval falls back and opens the springs 41 to allow relay 33 to fall back and to allow the release of the line switch C.

Should the called line have been busy or should the called subscriber not have an swered, then the relay 20 of repeater D; would not have energized. In a case of this kind, therefore, relay 33 will notbe energized and the battery Y of negative high potential will remain connected to the spring 44 of relay 40. Now when the calling subscriber hangs up his receiver, relay 14 falls back, relay falls back to complete the circuit of relay 40 as before. In this case the operationis exactly the same except that the negative battery Y is connected through springs 44 and,

43 to the calling line and to magnet 5. Battery Y is of such potential as to cause mag-- net 5 to operate in' the proper direction'to refund thecointo the subscriber,

It will be understood that should the calling subscriber have operated the connector to call a free line, that is, a line in a critical level of the switch, or a level in which the connector does not reverse thebattery, then the coin will be refunded to the calling subscriber in the same manner as if the v 28 energizes, and relay 15 called-subscriber had not answered. Also it is to be understood that if desired the normal conductors N of the calling line may as X or a battery, such as Y to the line circuit of line A for controlling the coin collector. A cord circuit such as described is commonly known to manual telephone systems and need not be herein described. 4

In Fig. 2, I have shown a modified form of my invention in which I have shown the repeater D, which is similar to the repeater D (Fig. 1), individual to the line of substation A, which is exactly like the substation A (Fig. 1). This repeater D issimilar in all its actions to the repeater D (Fig. 1) except that another relay 60 has been added in order to so arrange the circuits that when the line is called via the normals the repeateris cut off from the line. This repeater D it will be understood is between the line and its line switch.

It will be seen therefore that I have provided a very eflicient method of operating the coin collector to either refund or collect a coin at a calling station by means of an 'impulsing repeater eithe'r individual to or accessible to the line.

Having fully described and ascertained the features and aspects of my invention, what I consider to be new and des'ireto have protected by Letters Patent will be pointed out in the appended claims.

What I claim as my invention is:

1. In a telephone system, a line, a calling device for said line, an impulse repeating device for said line responsive to impulses from said calling device, an automatic switch controlled by said repeating device to extend a connection to a called subscriber, a coin collector on said line, a relay in said repeating device controlled by the completion or noncompletion of the said connection for determining whether the coin is to be collected or refunded, and another relay in said repeating device for operating the coin collector in the manner determined when the release of the connection is intiated.

2. In a telephone system, a-line, a calling device for said line, animpulse repeating device for said line responsive to impulses from said calling device, an automatic switch controlled by said repeating device :to extend a connection to a called subscriber,

a coin collector on said line, a relay in said repeating device controlled by the completion or noncompletion of the said connection for determining whether the coin is to be collected or refunded, and another relay in said repeating device operated by the calling subscriber for operating the coin collector in the manner determined when the release of the connection is initiated.

3. In a telephone system, a line, a coin meow/2e collector for said line, means including an impulse repeating mechanism for extending flowing in said talking circuit, means indi vidual to 'said repeating mechanism and responsive to the called subscriber for preparing circuits for said magnet, and means controlled by the calling subscriber when releasing t e connection for completing the circuit of said magnet to collect the coin.

4. In a telephone system, a line, a coin collector for said line, means including an impulse repeating mechanism for extending a talking circuit from said line to another line, a magnet for controlling said coin collector nonresponsive to the normal current flowing in' said talking circuit, means individual to said repeating mechanism and responsive to the called subscriber for preparing circuits for said magnet, and means controlled by the calling subscriber when releasing t e connection for completing the circuit of said magnet to collect or refund the coin.

collector forsaid line, means including an impulse repeating mechanism for extending a talking circuit from said line to another line, a magnet for controlling said coin collector nonresponsive to the normal current flowing in said talking circuit, means individual to said repeating mechanism and responsive to the called subscriber for preparing circuits for said magnet, and means controlled by the calling subscriber when releasing the connection for completing the circuit of said magnet over the talking circuit to collect the coin.

6. In a telephone system, a line, a coin collector for said line, means including an impulse repeating mechanism for extending a talking circuit from said line to another line, a magnet for controlling said coin collector nonresponsive to the normal cur- 'rent flowing in said talking circuit, means individual to said repeating mechanism and responsive to the called subscriber for prerepeating mechanism for preparing a circuit for the magnet from either said positive or lltl negative battery, and means controlled by the calling subscriber for completing the nection from said line, a line relay forsaid v repeater, a back bridge relay for said repeater, said back bridge relay controlled by the called subscriber to prepare a circuit for said magnet, said line relay controlled by the calling subscriber to first extend the connection and to thereafter complete the circuit of said magnet to either collect or refund the coin.

9. In a telephone system, a line, a coin collector for said line, a magnet for controlling said coin collector to either refund or collect a coin deposited therein, a repeater, a switch for said line for extending a connection from the line to the repeater, said repeater controlled from the line for 1 extending the connection to a called line,

means in the repeater for determining whether the coin is to be collected or refunded, means controlled by a calling subscriber for releasing the connection to a called subscriber, and means in the repeater for operating the magnet in the manner predetermined and for preventing the release of the connection to the repeateruntil the magnet is operated.

10. In a telephone system, aline, means associated with said line for assessing a charge, a called line, means including an impulse repeater for establishing a talking circuit between said lines, a relay in said repeater operated exclusivelyby the calling subscriber when the connection is being released for operating said assessing means to assess a charge on the calling subscriber.

11. In a telephone system, a line, a toll assessing device for the line, means including an impulsing repeater for establishing a talking circuit between said line and a called line, a relay associated with the repeater for operating said device to assess a charge on the calling line, said relay operated by the calling subscriber in the manner set forth after the called subscriber has restored his receiver to the hook.

12. In a telephone system, a line, a toll assessing device for the line, means including an impulsing repeater for establishing a talking circuit between said line and a called line, a relay associated with the repeater for operating said device to assess a charge on the calling line, said relay operated by the calling subscriber exclusively to assess the charge after the called subscriber has answered and before he disconnects.

13. In a telephone system, a line, atoll nccogzae assessing device for the line, means including an impulsing repeater for establishing a talking circuit between said line and a called line, a relay associated with the repeater for operating said device to assess a charge on the calling line, said relay operated by the calling subscriber exclusively to assess the charge while the called telephone is inactive.

14. In a telephone system, a line, a toll assessing device for said line, means including a repeater accessible to the line for extending a talking circuit from the line, and means in the repeater for supplying current to the talking circuit of one strength and for increasing the current in the talk-f ing circuit to operate the coin collector to collect or refund the coin.

l5. In a telephone system, a line, a coin collecting device for the line, a magnet for operating the coin collector to either collect or refund a coin deposited therein, a pair of batteries of difi'erent potential, means including a repeater for extending a talking circuit from said line, means in the repeater for connecting one of said batteries to the talking circuit to supply talking battery to the calling line, and for connecting the other battery to the line to either collect or refund the coin.

16. In a telephone system; a line, a toll assessing device for said line, means for es-- tablishing a talking circuit between said line and another line, said talking circuit including a trunk line divided into two inductively connected sections, means in one section for repeating impulses to the other section to establish said connection, means individual to said trunk line controlled by the completion ornoncompletion of the talking circuit for determining whether or not a charge is to be assessed, and a relay in one of said sections controlled thereafter by the callling subscriber exclusively to assess the tol 17. In a telephone system, a line, a coin collector for said line, means for extending a talking circuit from said line to another line, said circuit divided into two inductively connected sections, the first line in one of said sections, a magnet for controlling the coin collector nonresponsive to the normal current flow in the talking circuit, means controlled by thecalling subscriber when releasing the connection for operating said magnet to either collect or refund the coin, said first line including an impulse sender for sending impulses over the first line, and means at the central oilice responsive thereto for repeating the impulses from the said section associated with the first line to the second section.

18. In a telephone system, a line, a coin collector for said line, a trunk line, means for connecting said line with said trunk ing tions, and means for repeating 1 line,

tively connected sections, means for extending connection from said trunk line to another line to establish a talking circuit between the said first line and the said other line, a magnet for controlling the'coin collector nonresponsive to normal current flowin the talking circuit, means controlled by the calling subscriber when releasing the connection to operate said magnet to either collect or refund the coin, a calling device in the first line, and means associated with said trunk for repeating impulses from 'said calling device from the first section of the trunk to the second section of the trunk for controlling the means for extending connection from the trunk line to said other line.

19. In a telephone system, a line, a toll assessing device for the line, a magnet for collecting coins, means for establishing a talking circuit between said. line and another line, means controlled by the completion or non-completion of the call for determining whether or not a charge is to be assessed, means controlled thereafter exclusively by the calling man for assessing the toll, said talking circuit including a trunk line, said magnet connected to said talking circuit during conversation; said trunk line divided into two inductively connected secimpulses from one section of the trunk ne to the other, said second means in said trunk line.

20. In a telephone system, aline, a coin collector for said line, means for extending a talking circuit from said line to another line, a magnet, for controlling the coin collector non-responsive to normal current fiowin in the talking circuit, and means controlled by the called tsubscrlber when releasing the connection for operating said magnet over the talking circuit to either collect or refund the coin, said talking circuit consisting of two inductively related sections, and having means for repeating impulses from one section to the other.

21. In telephone system, means for connecting two telephone subscribers in a talking connection, an assessing device in combination therewith havin an operating magnet, exclusively contro ed by the calling subscriber for assessing a charge for the connection, said magnet connected to said talking circuit during conversation, said talking circuit consisting of two inductively related sections, and having means for repeating impulses from one section to the other. a

22. In a telephone system, a line, a coin collector for said line, means including an impulse repeating mechanism for extending a connection from said line to a called line, a magnet for controlling the coin collector non-responsive to the normal current flowing inthe talking circuit, a battery of high posaid trunk line divided into two inductential, means in the repeating mechanism .lector non-responsive to the normal current flowing in the talking circuit, a battery of high potential, means in the repeating mech-- anism for preparing a circuit for the magnet from said battery, and means controlled by the calling subscriber for completing the prepared circuit to collect the coin.

24. In a telephone system, a line, a coin, collecting device therefor, means including an impulse repeater for extending a connection from said line to a called line, a

magnet for said device for collecting or refunding a coin, means for connecting said magnet to the talking circuit when a coin is deposited and for maintaining it so connected during conversation, a relay in the repeating device, and means for operating said relay when the calling subscriber restores his receiver for controlling said magnet to collect the coin.v

25. In a telephone system, 'a line, a coin collecting device therefor, means including an impulse repeater for extending a connection from said line to a called liner'a magnet for said device for collecting or refunding a coin, means for connecting said magnet to the talking circuit deposited and for maintaining it so connected during conversation, a relay in the repeating device, and means for operating said relay when the calling subscriber restores his receiver for controlling said mag- 26. In a telephone system, line, a coin collecting device therefor, means including an impulse repeater for extendin a connection from said line to a calle line, a magnet for said device normally disconnected from the line, said magnet forcollecting or refunding a coin, means for connecting said magnet to the linewhen afcoin is deposited and for maintaining it o connected during conversation; a relay in the repeating device controlled by the completion or non-completion of'the connection for determining whether the coin is" to be collected or refunded, and means for operating the qoin collector in the manner determined whgn the release of the connection is initiate v v I c 27. In a telephone s stem, a line, a coin collectin device there or, means including an impuIse repeater for extending a connection from said line'to a called line, a magnet for said device forcollecting or refunding a when a coin is coin, means for connecting said magnet to the talking circuit when a coin is deposited and for'maintaining it so connected during conversation, a polar relay bridged across the talking circuit at said repeater and controlled by the called subscriber, a circuit for said magnet prepared by said polar relay for said device for collecting or refunding a coin, means for connecting said magnet to the talking circuit when a coin is deposited and for maintaining itso connected during conversation, a polar relay bridged across the talking circuit at said repeater and adapted for control by the called subscriber, a second relay in said repeater controlled by the calling subscriber, and circuits for said magnet controlled jointly by said relays to either collect or refund the deposited coin.

29. In a telephone system, a calling line, a repeater, means for extending said line to said repeater, a line rela for su plying talking current to the cal ing line bridged across the talking conductors at said repeater, a coin collector'at the station on said line comprising a magnet irresponsive to said talking current, autom-aticswitches controlled by said line rela for extending the connectionto' a called ine after a coin is deposited in said collector, a high voltage source of current, andmeans in said repeater for connecting said source to the calling line for operating said magnet to collect the deposited coin.

30. In a telephone system, a calling line, a repeater, means for extending said line to said repeater a line relay for supplying talking current to the calling line bridged across the talking conductors at. said rememes peater, a coin collector at the station on said line comprising a magnet irresponslye to said talking current, automatic switches controlled by said line relay for extending the connection to a called line after-a coin is deposited in said collector, high voltage sources of positive and negative current, and means in said repeater for connecting one of said sources to the calling line to either 001- the talking conductors at said repeater, a

coin collector at the station on said line comprising a magnet 1rrespons1ve to said talking current, automatic switches controlled by said line relay for extending the connection to acalled line after a coin is deposited in said collector, a high voltage sourceof current, and a relay in said repeater con trolled by the calling subscriber for connecting said source to the calling line for operating said magnet to refund the deposited coin.

32. In telephone system, a calling line, a repeater, means for extending said line to said repeater, a line relay for su pl ing talking current to the calling line ri ged across the talking conductors at said repeater, a coin collector at the station on said line comprising a magnet irresponsive to said talking current, automatic switches controlled by said line relay for extending connection to'a called line after a com is deposited in said collector, a high voltage source of current, a second relay in said repeater controlled by the called subscriber, and a third relay in said repeater controlled by the calling subscriber and cooperating with said second relay to connect said source to the calling line for operatingsaid ma net to collect the deposited coin.

igned by me at Chicago, Cook County, Illinois, this 6th day of June, 1919.

TALBOT G. MARTIN.

the a 

